C :

#include<stdio.h>
void main()
{
	int n,i,j;
	scanf("%d",&n);
	//输出第i行的图形 
	for(i=1;i<=n;i++){
		//先输出n-i个空格 
		for(j=1;j<=n-i;j++){
			printf(" ");
		}
		
		//再输出2*i-1个星
		 
	   for(j=1;j<=2*i-1;j++) {
	   		printf("*");
	   }
	   
	   //先输出n-i个空格 
		for(j=1;j<=2*(n-i);j++){
			printf(" ");
		}
		
		//再输出2*i-1个星
		 
	   for(j=1;j<=2*i-1;j++) {
	   		printf("*");
	   }

	//先输出n-i个空格 
		for(j=1;j<=2*(n-i);j++){
			printf(" ");
		}
		
		//再输出2*i-1个星
		 
	   for(j=1;j<=2*i-1;j++) {
	   		printf("*");
	   }
	   printf("\n");
		}
}

C++ :

#include<iostream>
using namespace std;
int main(){
	
	int n;
	cin>>n;

	for(int i=1;i<=n;i++){
		
		for(int j=1;j<=n-i;j++)
			cout<<" ";
		
	
		for(int j=1;j<=2*i-1;j++)
				cout<<"*";
		
	
		for(int j=1;j<=n-i;j++)
			cout<<" ";
		
	
		for(int j=1;j<=n-i;j++)
			cout<<" ";
		
		
		for(int j=1;j<=2*i-1;j++)
				cout<<"*";
		
	
		for(int j=1;j<=n-i;j++)
			cout<<" ";
		
	
		for(int j=1;j<=n-i;j++)
			cout<<" ";
		
	
		for(int j=1;j<=2*i-1;j++)
				cout<<"*";
		
		cout<<endl;
	}
}

Python :

#!/usr/bin/env python3
  
n = int(input())
m = 1
k = n-1
for i in range(0,n):
	for p in range(0,3):
	 for j in range(0,k):
		 print(" ",end="")

	 for x in range(0,m):
		 print("*",end="")

	 for y in range(0,k):
		 print(" ",end="")
	print()
	k = k - 1
	m += 2